题目：https://leetcode.com/problems/rank-scores/
代码(github)：https://github.com/illuz/leetcode
给分数排名。
- 把 SELECT 套进去。
- 用 CASE 和 变量，逐行处理，速度比 1 变了很多。
Files
This branch is 206 commits behind illuz/leetcode:master.
178.Rank_Scores
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